Commit: aaa334d67aa21331abf0070ef0f7fd61330ec61a
Concentric circles at theta = 1:80
Concentric circles at theta = 1:80 - 80
Concentric circles at theta = 1:80 - 40
Concentric circles at theta = 1:80 + 100
Concentric circles at theta = 1:80 * 100